fix: prevent duplicate WASM channel activation on startup (#390)

Register boot-loaded WASM channel names with the extension manager via
set_active_channels() before set_channel_runtime() so the dedup guard
in activate_wasm_channel() is armed before the activation path becomes
available. This fixes 409 Conflict errors from the Telegram API caused
by two concurrent getUpdates polling loops.

Also fix pre-existing clippy warning in signal.rs test.

Co-authored-by: Claude Opus 4.6 (1M context) <[email protected]>

src/channels/signal.rs

@@ -2742,7 +2742,7 @@ mod tests {
         let ctx = ch.conversation_context(&metadata);
         assert_eq!(ctx.get("sender"), Some(&"+1234567890".to_string()));
         assert_eq!(ctx.get("sender_uuid"), Some(&"uuid-123".to_string()));
-        assert!(ctx.get("group").is_none());
+        assert!(!ctx.contains_key("group"));
     }
 
     #[test]

src/main.rs

@@ -602,6 +602,7 @@ async fn main() -> anyhow::Result<()> {
     if let Some(ref ext_mgr) = components.extension_manager
         && let Some((rt, ps, router)) = wasm_channel_runtime_state.take()
     {
+        ext_mgr.set_active_channels(loaded_wasm_channel_names).await;
         ext_mgr
             .set_channel_runtime(
                 Arc::clone(&channels),